Today I was looking at the ground on my alternator and noticed it was grounded to a bracket that is part of the frame work around the engine compartment. Is is best to ground it to the motor . or does it matter. Thanks for any advice Andy

Always to the frame, so that the circuit back to the batteries is as direct as possible. It's often good to establish a solid ground between the engine and the frame as well, so that connection is unquestionable.

Thanks I wonderd about that ground You are right Clifford , that is a 135 amp truck alt and if you look close at that hot wire it looks a little small what do you think ? And does it matter how long the ground wire is could I run it back down to the frame rail or back over to the ground connection that the battrey grounds to ?

Ok I got one of the answers I was looking for but I another ? . Can I run my alternator ground over to the place where my start battries are grounded. or can I just ground it to the motor on the driver side .